And play with it you might want to, because although I've turned off the image replacement by default, it's still available on the site! Just add "&butiwouldratherbereading=nedroid" to any Dinosaur Comics URL and you'll see something like this.

To pull this off I actually used some older code that hadn't been up on the site since - wow, 2004, I think - called "What if Dinosaur Comics had Puppies with Other Comics" (it was a good name then and it remains a good name now). In this same folder I found some old images that had been made then for other comics, so check out:

And feel free to make your own! Just draw in the white space in the mask file, keeping in mind that anywhere you put art that isn't white runs the risk of covering up text (the Penny Arcade one is especially bad for that) (as is the Pokey one but it's on purpose there!)